During his time at Queens College, he was active as a disc jockey and program director and in 1966 helped establish WQMC, the campus radio station.
In 1969, Elsas joined WVOX, a suburban FM radio station in New Rochelle, New York, where he broadcast a show called "Something Else Again" for the next two years.
Highlights from the interview have been featured in numerous Beatles documentaries and books, including in the permanent collection of the Museum of Television and Radio.
He presents a wide variety of rock, folk, jazz and blues in the tradition of progressive radio he helped to create.
He has interviewed numerous artists in studio including Elvis Costello, Ben Folds, Patti Smith, Edie Brickell and Ringo Starr.
In 2010, Elsas created Rock ‘N’ Roll Never Forgets, a live multi-media event that showcases his historic radio interviews with music legends such as Elton John, Jerry Garcia, Pete Townshend, and John Lennon along with his personal memories and behind-the-scenes stories, starting with the Top 40 radio that he grew up with, the progressive evolution of WNEW-FM, and his current work on WFUV and Sirius/XM.